[Y1-xCax]SrBaCu2.80 (PO4)0.20Oy samples with 0.10≤x≤0.40 were synthesized using the solid state reaction technique. X-ray diffraction patterns show that all the compounds crystallized into a 123 tetragonal structure. The analyses of the structure with Rietveld refinement were made using a model that contain one Cu(2) in a four coordination and not in five coordination as the other 123 tetragonal structures. This fact permits that the Tc increases with Ca concentration. All samples are superconductors as reported previously. © 2001 Elsevier Science B.V.
Gonzalez Gonzalez, J. C., Landinez Tellez, D. A., Albino Aguiar, J., & Bustamante Dominguez, A. (2001). Structural refinement of [Y<inf>1-x</inf>Ca<inf>x</inf>]SrBaCu<inf>2.80</inf> (PO<inf>4</inf>)<inf>0.20</inf>O<inf>y</inf> Physica C: Superconductivity and its Applications, 375-378. https://doi.org/10.1016/S0921-4534(01)00104-6